(countable) An instance of a disease or poor health. / (uncountable) A state of bad health or disease.

plural of illness

Abbreviation of Illinois.

(grammar) a word or phrase that expresses an inference (such as for or therefore). / an illation. / (grammar) the illative case, or a word in that case.

of, or relating to an illation. / (grammar) of, or relating to the grammatical case that in some languages indicates motion towards or into something.

plural of ill

A spiteful or vengeful attitude; a grudge; dislike.

(obsolete) Evil; wicked (of people). / (archaic) Morally reprehensible (of behaviour etc.); blameworthy. / Indicative of unkind or malevolent intentions; harsh, cruel.

Not well; imperfectly, badly

(intransitive, slang) To behave aggressively.